256154fbc3
The backlight and lcd subsystems can be notified by the framebuffer layer of blanking events. However, these subsystems, as a whole, can function independently from the framebuffer layer. But in order to enable to the lcd and backlight subsystems, the framebuffer has to be compiled also, effectively sucking in a huge amount of unneeded code. To prevent dependency problems, separate out the framebuffer notification mechanism from the framebuffer layer and permanently link it to the kernel. Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
47 lines
1.2 KiB
C
47 lines
1.2 KiB
C
/*
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* linux/drivers/video/fb_notify.c
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*
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* Copyright (C) 2006 Antonino Daplas <adaplas@pol.net>
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*
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* 2001 - Documented with DocBook
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* - Brad Douglas <brad@neruo.com>
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of this archive
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* for more details.
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*/
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#include <linux/fb.h>
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#include <linux/notifier.h>
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static BLOCKING_NOTIFIER_HEAD(fb_notifier_list);
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/**
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* fb_register_client - register a client notifier
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* @nb: notifier block to callback on events
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*/
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int fb_register_client(struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&fb_notifier_list, nb);
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}
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EXPORT_SYMBOL(fb_register_client);
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/**
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* fb_unregister_client - unregister a client notifier
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* @nb: notifier block to callback on events
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*/
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int fb_unregister_client(struct notifier_block *nb)
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{
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return blocking_notifier_chain_unregister(&fb_notifier_list, nb);
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}
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EXPORT_SYMBOL(fb_unregister_client);
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/**
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* fb_notifier_call_chain - notify clients of fb_events
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*
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*/
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int fb_notifier_call_chain(unsigned long val, void *v)
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{
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return blocking_notifier_call_chain(&fb_notifier_list, val, v);
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}
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EXPORT_SYMBOL_GPL(fb_notifier_call_chain);
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